One River Asset Management, LLC is an SEC-registered investment adviser based in Stamford, CT that reports managing 10 hedge funds on Form ADV. It reports $2.4 billion in regulatory assets under management. Its private funds, of all types, hold $2.5 billion in gross assets. Its disclosed U.S. stock holdings returned an estimated +3.3% 2026 YTD through Jun 30 (S&P 500: +9.5%), based on 13F filings. Over a longer period they returned an estimated +31.4% from Q3 2024 to Q2 2026, compared with +37.2% for the S&P 500, based on 13F filings.
- Regulatory assets under management
- $2.4 billionForm ADV Item 5.F
- Gross assets of private funds
- $2.5 billionAll private fund types, Form ADV
- Hedge funds managed
- 1010 private funds in total
- Employees
- 22Form ADV Item 5.A
- Registration
- SEC-registered adviserCRD 167835
- Latest Form ADV
- 10/14/2026Disciplinary disclosures: none reported
Estimated 13F portfolio performance
Estimated by AltMountain, derived from the firm’s public Form 13F filings. Not reported by the firm and not the return of any fund.
| Quarter | Est. 13F return | S&P 500 |
|---|---|---|
| Q2 2026 | +9.9% | +14.8% |
| Q1 2026 | -6.0% | -4.6% |
| Q4 2025 | +1.1% | +2.4% |
| Q3 2025 | +3.6% | +7.8% |
| Q2 2025 | +18.8% | +10.4% |
| Q1 2025 | -6.4% | -4.5% |
| Q4 2024 | +4.2% | +2.1% |
| Q3 2024 | +4.9% | +5.4% |
Estimate of the firm's disclosed long U.S. stock portfolio from its quarterly 13F filings, holding each quarter-end portfolio to the next quarter-end at prices implied by all 13F filers. It is a price return before dividends and fees, ignores shorts, options, bonds, cash and trading within the quarter, and is not the return of any fund. Disclosures
Manager of this firm? Report your fund’s actual net return, or email hello@altmountain.com to correct or remove this estimate. Removal requests from the firm are honored.
13F holdings as of Sep 30, 2026
All 41 share positions ($6,235,047) reported by One River Asset Management, LLC on Form 13F for the quarter ended Sep 30, 2026, filed Oct 21, 2026. Shown as filed with the SEC. Original filing on SEC.gov ↗ The estimated return above runs through Jun 30, 2026; it is updated when the SEC publishes its complete data for the quarter.
| Stock | Value | % of 13F portfolio | Shares | Shares vs prior quarter |
|---|---|---|---|---|
| State STR SPDR S&P 500 ETF T | $3,860,433 | 61.92% | 5,062 | -60.63% |
| Broadcom Inc | $237,756 | 3.81% | 677 | New |
| Costco Wholesale Corporation | $226,675 | 3.64% | 249 | -41.27% |
| Goldman Sachs Group Inc | $179,172 | 2.87% | 199 | New |
| Walmart Inc | $141,227 | 2.27% | 1,359 | +8.11% |
| Mcdonalds Corp | $135,331 | 2.17% | 586 | -42.44% |
| Netflix Inc. | $122,948 | 1.97% | 1,767 | -44.61% |
| Caterpillar Inc | $115,943 | 1.86% | 143 | New |
| Home Depot Inc | $95,589 | 1.53% | 336 | -36.48% |
| Nextera Energy Inc | $93,539 | 1.50% | 1,235 | +30,775.00% |
| Alphabet Inc | $93,022 | 1.49% | 273 | New |
| Ge Vernova Inc | $89,346 | 1.43% | 94 | New |
| Pepsico Inc | $81,354 | 1.30% | 642 | -26.46% |
| Jpmorgan Chase & Co | $72,783 | 1.17% | 220 | New |
| Alphabet Inc | $65,719 | 1.05% | 191 | New |
| Unitedhealth Group Inc | $52,125 | 0.84% | 142 | New |
| Blackrock Inc | $46,565 | 0.75% | 44 | -88.48% |
| Ge Aerospace | $44,033 | 0.71% | 141 | New |
| Applovin Corp | $42,403 | 0.68% | 146 | +274.36% |
| Seagate Technology Hldngs PL | $41,505 | 0.67% | 45 | +50.00% |
| Linde PLC | $38,921 | 0.62% | 82 | New |
| Oracle Corp | $38,856 | 0.62% | 283 | -30.98% |
| TJX Cos Inc New | $37,841 | 0.61% | 286 | -25.13% |
| Tesla Inc | $34,062 | 0.55% | 96 | -60.33% |
| Wells Fargo & Co | $32,821 | 0.53% | 410 | -61.93% |
| Sandisk Corp | $31,318 | 0.50% | 18 | -37.93% |
| Procter & Gamble Co | $26,296 | 0.42% | 181 | -82.44% |
| RTX Corporation | $24,320 | 0.39% | 131 | -85.81% |
| Morgan Stanley | $23,134 | 0.37% | 123 | New |
| Union Pac Corp | $22,859 | 0.37% | 84 | New |
| Intuitive Surgical Inc | $16,672 | 0.27% | 41 | -95.32% |
| Verizon Communications Inc | $16,559 | 0.27% | 361 | -75.14% |
| Uber Technologies Inc | $9,934 | 0.16% | 145 | -77.66% |
| Citigroup Inc | $9,582 | 0.15% | 74 | New |
| At&t Inc | $8,198 | 0.13% | 336 | -94.75% |
| Conocophillips | $7,259 | 0.12% | 58 | New |
| Lam Research Corp | $6,899 | 0.11% | 21 | New |
| Honeywell Intl Inc | $4,430 | 0.07% | 21 | New |
| Texas Instrs Inc | $4,201 | 0.07% | 15 | New |
| Eaton Corp PLC | $2,578 | 0.04% | 6 | New |
| Disney Walt Co | $839 | 0.01% | 8 | -99.07% |
Changes since Jun 30, 2026
Comparing the share counts in the two quarter-end filings: 18 new positions, 30 sold out, 4 increased, 19 reduced and 0 unchanged.
New positions
| Stock | Value | Shares |
|---|---|---|
| Broadcom Inc | $237,756 | 677 |
| Goldman Sachs Group Inc | $179,172 | 199 |
| Caterpillar Inc | $115,943 | 143 |
| Alphabet Inc | $93,022 | 273 |
| Ge Vernova Inc | $89,346 | 94 |
| Jpmorgan Chase & Co | $72,783 | 220 |
| Alphabet Inc | $65,719 | 191 |
| Unitedhealth Group Inc | $52,125 | 142 |
| Ge Aerospace | $44,033 | 141 |
| Linde PLC | $38,921 | 82 |
| Morgan Stanley | $23,134 | 123 |
| Union Pac Corp | $22,859 | 84 |
| Citigroup Inc | $9,582 | 74 |
| Conocophillips | $7,259 | 58 |
| Lam Research Corp | $6,899 | 21 |
| Honeywell Intl Inc | $4,430 | 21 |
| Texas Instrs Inc | $4,201 | 15 |
| Eaton Corp PLC | $2,578 | 6 |
Sold out
| Stock | Value at Jun 30, 2026 | Shares held then |
|---|---|---|
| Meta Platforms Inc | $2,280,198 | 4,048 |
| Ishares TR | $1,486,657 | 47,061 |
| Microsoft Corp | $1,132,862 | 3,037 |
| Booking Holdings Inc | $553,435 | 3,105 |
| Berkshire Hathaway Inc Del | $253,197 | 506 |
| Abbott Laboratories | $222,857 | 2,456 |
| Palantir Technologies Inc | $183,872 | 1,576 |
| Kraneshares Trust | $177,897 | 7,270 |
| Intuit | $161,820 | 620 |
| S&P Global Inc | $158,831 | 390 |
| Thermo Fisher Scientific Inc | $155,422 | 310 |
| Salesforce Inc | $148,984 | 951 |
| Bilibili Inc | $138,471 | 8,246 |
| Mastercard Incorporated | $120,696 | 235 |
| Ishares Bitcoin Trust ETF | $108,592 | 3,262 |
| Amgen Inc | $107,912 | 298 |
| Gilead Sciences Inc | $96,145 | 761 |
| Accenture PLC Ireland | $93,579 | 752 |
| Chevron Corporation | $92,328 | 557 |
| Boeing Co | $70,786 | 327 |
Largest increases
| Stock | Change in shares | Change | Value now | Shares now |
|---|---|---|---|---|
| Nextera Energy Inc | +1,231 | +30,775.00% | $93,539 | 1,235 |
| Applovin Corp | +107 | +274.36% | $42,403 | 146 |
| Seagate Technology Hldngs PL | +15 | +50.00% | $41,505 | 45 |
| Walmart Inc | +102 | +8.11% | $141,227 | 1,359 |
Largest reductions
| Stock | Change in shares | Change | Value now | Shares now |
|---|---|---|---|---|
| State STR SPDR S&P 500 ETF T | -7,794 | -60.63% | $3,860,433 | 5,062 |
| Blackrock Inc | -338 | -88.48% | $46,565 | 44 |
| Intuitive Surgical Inc | -835 | -95.32% | $16,672 | 41 |
| Costco Wholesale Corporation | -175 | -41.27% | $226,675 | 249 |
| At&t Inc | -6,058 | -94.75% | $8,198 | 336 |
| RTX Corporation | -792 | -85.81% | $24,320 | 131 |
| Procter & Gamble Co | -850 | -82.44% | $26,296 | 181 |
| Mcdonalds Corp | -432 | -42.44% | $135,331 | 586 |
| Netflix Inc. | -1,423 | -44.61% | $122,948 | 1,767 |
| Disney Walt Co | -856 | -99.07% | $839 | 8 |
| Home Depot Inc | -193 | -36.48% | $95,589 | 336 |
| Wells Fargo & Co | -667 | -61.93% | $32,821 | 410 |
| Tesla Inc | -146 | -60.33% | $34,062 | 96 |
| Verizon Communications Inc | -1,091 | -75.14% | $16,559 | 361 |
| Uber Technologies Inc | -504 | -77.66% | $9,934 | 145 |
| Pepsico Inc | -231 | -26.46% | $81,354 | 642 |
| Sandisk Corp | -11 | -37.93% | $31,318 | 18 |
| Oracle Corp | -127 | -30.98% | $38,856 | 283 |
| TJX Cos Inc New | -96 | -25.13% | $37,841 | 286 |
Each list shows up to 20 positions, largest first by dollar amount. Changes compare two quarter-end snapshots, with the earlier share count adjusted for stock splits AltMountain detected. They do not show when, or at what price, anything was bought or sold.
From public Form 13F filings, not verified. Form 13F is filed up to 45 days after the quarter ends, so positions may have changed. It lists only certain long positions in U.S.-listed stocks and exchange-traded funds; options are not shown here, and short positions, most bonds, cash, non-U.S. securities and private investments are not reported at all, so a holding may be one side of a hedge. A filing covers the manager as a whole, not any single fund, and filings contain errors. This is not investment advice or a recommendation to buy or sell any security. Disclosures
Hedge funds filing Form D (3)
Matched to this firm by the fund names and related persons in each Form D. The list may be incomplete.
Private funds reported on Form ADV (11)
As reported in the adviser's Form ADV filed Jun 26, 2024. Funds also listed from Form D are shown above.
From SEC filings. Firm data comes from the SEC's Form ADV data as of Oct 2, 2026; performance estimates come from Form 13F. AltMountain has not verified this information, and it is not an offer, solicitation or recommendation. Full disclosures